i adore pretty much any name that is related to the ocean and/or sea! most of the names i currently have are related to the sea. however, i’d love to know what your favorite water-related names are 
cordelia (celtic: daughter of the sea)
kai (hawaiian: sea)
mari (welsh: drop of the sea)
rosemary (latin: dew of the sea)
ocean (english, nature name)
marina (latin: from the sea)
marnie (english: of the sea)
i love this question! marnie is one of my favorites 
here are some other suggestions 
caspian (caspian sea)
ginerva (white wave)
sailor (occupation name, related to the sea)
aqua (blue, like the ocean)
cove (small bay)
harbor (word name, a part of a body of water that is near land)
ocean (word name, a body of water)
lovely list! i really like caspian, aqua, and sailor!!
Your list is lovely!
Some of my faves are:
[name_u]Murphy[/name_u]
[name_f]Tallulah[/name_f]
Dwynwyn
[name_f]Meraud[/name_f]
[name_u]Reef[/name_u]
[name_u]Cove[/name_u]
Samphire
[name_u]Sailor[/name_u]
Seafarer
[name_u]Mariner[/name_u]
[name_f]Nerissa[/name_f]
[name_f]Nerida[/name_f]
[name_f]Naia[/name_f]
[name_m]Caspian[/name_m]
[name_u]Merlin[/name_u]
never knew merlin had meanings that tied into the sea, very cool, i’m adding him to my gp list right now! nerissa, naia, and tallulah are all lovely as well.
do you know how to pronounce dwynwyn? it’s intriguing but i can’t quite figure out how to pronounce it.
It can be spelled Dwynwen too - so like Dwin-wen is how I say it
(These are some various pronunciations of it that may be more helpful)
[name_f]My[/name_f] favorite water-related name is [name_f]Tallulah[/name_f]! Meaning “leaping waters” 
[name_u]Iara[/name_u]
[name_u]Kai[/name_u]
[name_u]Kainoa[/name_u]
[name_u]Lincoln[/name_u]
[name_m]Lachlan[/name_m]
[name_u]Mai[/name_u]
Maraĵa
[name_f]Maris[/name_f]
[name_f]Maristela[/name_f]
[name_f]Mira[/name_f]
[name_f]Meriel[/name_f]
[name_f]Naia[/name_f]
Neilos
[name_u]Windsor[/name_u]
[name_f]Ondine[/name_f] (French: wave)
[name_f]Alda[/name_f] (Icelandic: wave)
[name_f]Mira[/name_f] (Sanskrit: ocean)
Murren (Old [name_u]Irish[/name_u]: white sea)
Baleen (whale food filtration)
[name_u]Bay[/name_u]
[name_f]Coralie[/name_f]
[name_f]Mirabai[/name_f]
[name_f]Oceane[/name_f]
[name_m]Merrick[/name_m] (lord of the sea)
[name_m]Tide[/name_m]
Tidal
[name_u]Wave[/name_u]
[name_m]Seaton[/name_m] (sea town)
[name_u]Cove[/name_u]
Wake
[name_u]Coast[/name_u]
Curren/t
[name_f]Coral[/name_f]
[name_f]Doris[/name_f]
[name_f]Maren[/name_f]
[name_f]Saraswati[/name_f]
[name_f]Derya[/name_f]
[name_u]Gal[/name_u]
[name_f]Nanami[/name_f]
[name_u]Kaimana[/name_u]
[name_f]Kailani[/name_f]
Tethys
Mavisu(Turkish) ‘blue water’
[name_f]Mairwen[/name_f]
[name_f]Morgana[/name_f]
[name_u]Morgan[/name_u]
[name_f]Guinevere[/name_f]
[name_u]River[/name_u]
[name_u]Lake[/name_u]
[name_f]Meraud[/name_f]
[name_u]Brooke[/name_u]
[name_f]Avonlea[/name_f]
[name_f]Winslet[/name_f]
[name_f]Araluen[/name_f]
[name_f]Eyre[/name_f]
[name_u]Marlowe[/name_u]
[name_m]Dacre[/name_m]
[name_m]Caspian[/name_m]
[name_u]Cove[/name_u]
Driftwood
[name_u]Fjord[/name_u]
[name_m]Ford[/name_m]
[name_m]Fordham[/name_m]
[name_m]Fisher[/name_m]
[name_m]Havelock[/name_m]
[name_m]Hartwell[/name_m]
[name_m]Petrichor[/name_m]
[name_m]Innes[/name_m]
[name_u]Thames[/name_u]
[name_f]Tallulah[/name_f] (choctaw, irish - leaping water)
[name_u]Kaimana[/name_u] (hawaiian - the power of the ocean)
[name_f]Asherah[/name_f] (sumerian - she who treads on the sea)
[name_f]Kaia[/name_f] (hawaiian - sea)
[name_f]Kailani[/name_f] (hawaiian - sea, sky)
[name_f]Mariska[/name_f] (hungarian - drop of the sea)
[name_f]Maristela[/name_f] (latin - star of the sea)
[name_f]Meriel[/name_f] (irish - of the bright sea)
[name_f]Mirja[/name_f] (finnish - drop of the sea)
[name_f]My[/name_f] Icelandic / Old Norse favorites:
Hlér - ocean, sea
Hafljótr - light of the ocean
Hafrún - magic of the sea
Sær - sea
Sæsól - sun of the sea
Brim - wave, surge
Foss - waterfall
Skær - rock in the sea
Elliði - fast sailing ship
Laugi - warm pool
Dúnn - dune
Other favorites
[name_u]Bay[/name_u]
[name_m]Fisher[/name_m]
[name_m]Llyr[/name_m]
[name_u]Azure[/name_u]
[name_u]Lake[/name_u]
[name_f]Maris[/name_f] / [name_f]Stellamaris[/name_f]
[name_f]Ondine[/name_f] / [name_f]Undine[/name_f]
[name_m]Poseidon[/name_m]
[name_u]Ocean[/name_u] / Océan
[name_m]Holmes[/name_m]
[name_u]Mar[/name_u]